Crushing-mill.



T. J; STURTEVANT.

GRUSHING MILL.

APPLICATION FILED MAY a1, 1913.

1,105,712, Patented Aug. 4, 1914,

T. J. STURTBVANT.

GRUSHING. MILL.

APPLICATION FILED MAY31, 191a.

PatentedAug. 4, 1914.

3 SHEETS-SHEET 2.

T. J. STURTEVANT.

GRUSHING MILL.

APPLICATION FILED MAY 31, 1913.

Patented Aug. 4, 19m

a SHEETS-SHEET 3.

' of the output of the mill.

UNITED STATES PATENT OFFICE.

THOMAS JOSEPH STURTEVAN'I, F WELLESLEY, MASSACHUSETTS, ASSIGNOR TO STURTEVANT MILL COMPANY, A CORPORATION OF MAINE.

CRUSHING-MILL.

To all whom it may concern:

Be it known that I, THOMAS J. STURTE- \ANT, a citizen of the United States, resid ing at ellesley, in the county of Norfolk and State of Massachusetts, have invented or discovered certain newand useful Improvements in Crushing-Mills, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain improvements on the crushing mill of the Sturtevant U. S. Patent No. 851,121, dated June 18, 1907, the present invention having for its object to provide means whereby a certain proportion of the crushed material may be discharged through a sample spout, as is sometimes desirable when it is necessary to ascertain the quality of the materials being crushed by separating a small percentage of the material during a long continued. run of the mill.

In the accompanying drawings Figure 1 is an elevation of the improved mill and Fig. 2 is a vertical sectional view thereof. Fig. 3 is a plan view of the top section of the mill casing. Fig. 4 is a detail viewof the double hinge bracket. Fig. 5 is a plan view of one of the swinging casing parts or sections. Fig. 6 is a detail view of a hop per for the sample spout. Fig. 7 is a detail section on line 77, Fig. 3.

Referring to the drawings, 12 denotes the base portion of the mill frame and which base portion is constructed to provide a closed casing forhousing the mill gearing, .he said base or gearcasing being boltedto supporting beams or timbers 13. The driving shaft 11 is journaled in suitable bearings 15 and 16 bolted, respectively, to the gear casing and to the supporting timber frame-work structure, said driving shaft being provided with fast and loose pulleys 17 and 18 and with a bevel pinion 19 meshing with a bevel gear 20 provided with a vertical sleeve 21 fitting a squared portion of the vertical shaft 22. The shaft 22 is stepped in a cupped bearing 23 supported on a lever or lighter-bar 24 which is adjustable in the usual manner for the purpose of raising or lowering the shaft 22 and thus varying the relative positions of the crushing members to vary the degree of fineness The upper wall of the gear casing 12 is provided with an upwardly projecting flange 25 which is over- Specification of Letters Patent.

operation. By lighter-bar 24 the distance between the- Patented Aug. 4, 1914..

Application filed May 31, 1913. Serial No. 770,960.

lapped by a downwardly projecting flange formed on a collar 26 mounted on the upper end of the sleeve 21, this construction affording a dust-lock which will exclude dust and grit from the vertical shaft 22 to protect the lower bearing of said shaft.

The upper section 27 of the mill frame or casing is mounted on the base or gear-casing section 12 and is lirmly bolted thereto. casing section 27 is constructed to form a receptacle which receives and discharges the crushed material, and the upper end of the inner conical portion of the lower wall of sa1d casing forms an upwardly projecting flange 28 loosely encircling the vertical shaft 22-, said flange 28 being overlapped by a downwardly extending flange on a collar 29 on the said shaft 22, and preferably formed integral with scraper arms 30 rotating with the said shaft 22. These overlapping parts provide a second dust-lock.

The top portion of the casing of the mill is composed of two semicircular swinging 'door-like parts 31 and 32 each of which is separately hinged on pins33 mounted on a hinge bracket 34 bolted to the casing part 27. Mounted on the interior wall of these swinging door-like parts 31 and 82 are the corrugated stationary crushing liners 35 which cooperate with the crushing nut 36 on the upper end of the squared portion of the shaft 22 and fitting said squared portion so as to rotate with said shaft. This crushing nut is outwardly flared downwardly, corresponding somewhat in form to the crushing liners 35 with which the saidcrushing nut cooperates in the crushing adjusting the lever or crushing nut and crushing liners may be varied to vary the degree of fineness of the output of the mill, as will be understood.

The hingedcasing part 31 is provided with a lug or projection 37 which is pivotally mounted on a latch yoke 38 adapted to be swung into position to embrace a lug or projection 39 on the hinged casing part 82, said yoke being provided with a locking screw 40 operated by a hand wheel 41 so that said yoke may be secured in looking position by means of said screw and hand wheel, and may be readily released or unlocked when desired, as will be evident. The hinged or swinging casing parts 31 and 32 are each provided at their upper parts with a semi- This 1 circular recess 42 which affords a bearing for the upper end of the vertical shaft 22, and said bearing is preferably lubricated from anoil cup 43 mounted on one of said swinging casing parts. Consumers of coal in large quantities frequently buy their coal at the fuel value thereof, and to determine this fuel value sam les of a ton or more are frequently taken rom a cargo often coming in a form requiring crushing as well as sam- 'pling.. As hand sampling to secure fair samles from an entire cargo is a slow and somewhat diflicult operation the present inveniZ tion provides means whereby a sample, which may consist of any desired percentage of the run of fuel, may be obtained during the crushing operation. To this end the casing section 27 isprovided with a sample discharge spout or opening 44 in addition to the regular discharge openings 45, said sample discharge opening communicating with a discharge spout 46. The regular discharge spouts or openings 45 slope outwardly from the base of the conical wall 47 of the casing part 27, while the entrance. 48 from the chamber of the mill tothe sample discharge 9 which mounted on one pm,

5 ing sizes. or lengths it crushed material discharged I with the construction is raised considerably above the opening44 floor portion 49 of the chamber horizontal of the mill, and which 'floor portion represents the level from which the regular .dis-

charge openings 45 slope. downward outwardly. This raised entrance 48- to the sample discharge opening'44 is afiorded, by a hopper 50 the inner partof which, as shownin Fig. 3, is curved to correspond to the curved path of movement of the lower end of the crushing nut, so that said crushing nut will discharge a certain amount of crushed -'material into the said hopper 50 during its rotation. The hopper or receiver 50 is. preferablyremovably mounted in the millchamher, and by providing hoppers of different will be obvious that the percentage of from the sample spout, as compared with the entire output. of the 'mill, may be varied. .For example, the

represent a very large .size of hopper, while the sample hopper shown in Fig. 6 may represent a small sized hopper adapted to receive and discharge a relatively small percentage of the crushed material.

'By providing independent hinge pins for the swinging casing sections 31 and greater strength is afforded as compared shown in Patent No. 857,121 herein before referred both swinging casing ,sections are and provision is also made for independently adjusting the said swinging sections vertically so that they may be in roper'positions for cpemn and clost e same without too muc friction.

prices based on sample receiving hopper shown in Fig. 3 may to, and in Such independent vertical adjustment'may be effected by the use of thin washers 51 placed beneath the ears or lugs 52 on said swinging casing sections. In order to afford a proper locking engagement between these swinging sections 31 and 32 and the casing part 27 the said casing part is provided at its top with an annular locking flange '53 which is preferably outwardly flaring in cross section, as shown, and which fits corresponding recesses formed in the lower edges of the said swinging sections, so that these parts, when the said swinging sections are closed, will be in secure locking engagement with said casing part 27 and will, in'the locking construction herein shown,"be held down against the said casing part by wedging action, owing to the wedge-like form of the said flange and recesses. The material to be crushed may be fed to the mill through a hopper opening, as 54, formed in one of the said swinging casing sections.

The invention is. not to be understood as being limitedto the details of construction herein shown and described, as such details mav be varied widely, within the province .of mechanical skill, without departing from the scope of the invention.

Having thus described my invention I claim and desire to secure by LettersPatent:

1. In a crushing mill, a sampling spout communicating with the crushing chamber of the mill andadapted to receive and charge a predetermined portion of, the crushed material, and one ormore discharge spouts adapted to take care of the remainder of the crushed material.

2. In a crushing mill, a sampling, spout communicating with the crushing chamber of the mill and adapted to receive and discharge a predeterminedportion of the discrushed material, and one or more discharge spouts adapted to take care of the remainder of the crushed material, the entrance to the said sampling spout from the crushing chamber of the mill being above the level of the entrance or entrances from the chamber of the mill to the said discharge spout or spouts.

3. In a crushing mill, a sampling spout communicating with the crushing chamber of the mill and adapted to receive and discharge a predetermined portion of the crushed material, one or more discharge spouts adapted to take care of the remainder of' the crushed material, and a removable hopper forming the entrance to said sampling spout. p e

4. In a crushing mill, a samplin spout communicating with the crushing c amber of the mill and adapted to receive and discharge .a predetermined portion of the crushed material, one or more discharge spouts adapted to take care of the remainder of the crushed material, and a removable hopper formingthe entrance to said sampling spout, the top of said hopper being above the level of the entrance or entrances from the chamber of the mill to the said discharge spout or spouts.

5. A crushing mill provided with a sampling spout COI'llIllllIllCiltlDgWlth the crushing chamber of the mill and adapted to receive a predetermined portion of the crushed material, said spout extending outward so as to discharge the sampled moiety of the crushed material outside of the mill casing.

G. A crushing mill provided with a samplingspout communicating with the crushing chamber of the mill and adapted to receive a predetermined portion of the crushed material, said spout extending outward so as to discharge the sampled moiety of the crushed material outside of the mill casing, and a removable hopper forming the entrance to said sampling .spout from the chamber of the mi 1.

7. A crushing mill provided with a sampling spout communicating with the crushing chamber of the mill and adapted to receive a predetermined portion of the crushed material, said spout extending outward so as to discharge the sampled moiety of the crushed material outside of the mill casing, the entrance to said sampling spout from the chamber of the mill being above the bottom of the crushing chamber.

8. A crushing mill provided with a sampling spout communicating With the crushing chamber of the mill and adapted to receive a predetermined portion of the crushed material, said spout extending outward so as to discharge the sampled moiety of the crushed material outside of the mill casing, and a removable hopper forming the entrance to said sampling spout from the chamber of the mill, the top of said hopper being above the bottom of the crushing chamber.

In testimony whereof I afiix my signature, in presence of two witnesses.

THOMAS JOSEPH STURTEV'ANT.

Witnesses:

L; H. STUR'rnvANT, FLORA B. HECKER. 

